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Nickel Deposition on Hydrodemetallation Catalysts

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Nickel Deposition on Hydrodemetallation Catalysts NICKEL DEPOSITION ON HYDRODEMETALLATION CATALYSTS XINJIN ZHAO B.S., Taiyuan University of Technology (1982) M.S., Institute of Coal Chemistry, Academia Sinica (1986) M.S.C.E.P., Massachusetts Institute of Technology (1990) Submitted to the Department of Chemical Engineering in partial fulfillment of the requirements for the degree of Doctor of Science in Chemical Engineering at the MASSACHUSETTS INSTITUTE OF TECHNOLOGY February 1993 ®Massachusetts Institute of Technology 1993. All rights reserved. Author Department of Chemical Engineering November 13, 1993 Certified by James Wei Professor E/ritus of Chemical Engineering Thess Supervisor Accepted by Robert E. Cohen Chairman, Departmental Committee on Graduate Students MASSACHUSETTSINSTITUTE OFTECHNOLOGY FEB 26 1993 ARCHIVES LBRARIES NICKEL DEPOSITION ON HYDRODEMETALLATION CATALYSTS by Xinjin Zhao Submitted to the Department of Chemical Engineering on November 13, 1992, in partial fulfillment of the requirements for the degree of Doctor of Science in Chemical Engineering Abstract The prevailing metals in petroleum are nickel and vanadium which exist in porphyrins and asphaltenes. These organometallic molecules are large and their sizes approach the pore sizes of hydrotreating catalysts. As a result, these compounds deposit on the catalyst surface during hydrotreating processes and irreversibly destroy the cat- alysts by affecting transport into intraparticle fine pores as well as causing chemical changes when the deposited metals interact with the original active components on the catalysts. A better understanding of the deposition phenomena on the catalysts would establish a basis for developing improved hydrotreating catalysts. Nickel etio-porphyrin was used as a model compound to study nickel deposition and the interaction of the deposits with the catalytic components on presulfided CoO - MoO3/A1 203 hydrodemetallation catalysts under industrially-relevant pro- cess conditions, though no diffusion effects were present in the study. The structures of the nickel deposits on the aged catalysts were characterized by various microscopic and spectroscopic techniques. The nickel deposits were identified as nickel sulfide (Ni7S 6) in crystallite form. At a nickel loading of about 20%, the average size of the crystallites was estimated to be about 10 to 15 nanometers, while crystallites with the sizes up to 100 nanometers were also observed. X-ray elemental mapping and X-ray microanalysis on a dedicated scanning trans- mission electron microscope (STEM) and high resolution transmission electron mi- croscope (HRTEM) showed that nickel sulfide deposits were strongly associated with cobalt sulfide (Co9 s8) on the catalyst. In contrast, only about 20 to 25% of the molybdenum was associated with the nickel deposits as a segregated molybdenum disulfide (MoS 2) surface layer phase, the rest of the molybdenum disulfide forms 3 separate entities on the catalyst surface. The association between cobalt and nickel sulfides was shown to be a result of solid solution formation between the two sulfides, while the segregation of molybdenum sulfide is due to its lower surface energy. Segregation of molybdenum disulfide was quantitatively determined by X-ray microanalysis on scanning transmission electron microscope and directly observed on high resolution transmission electron microscope. It was also showed that the degree of segregation decreases for crystallites smaller than about 15 nanometers. Nickel sulfide deposits enhance the sintering of the catalytic metal sulfides by low- ering their Tammann temperatures. Electron microscopic studies showed that the sintering of the catalytic metal sulfides, especially cobalt sulfide, increased with the presence of nickel sulfide deposits. The effect was also discussed on hypothetical phase diagrams. It was showed that there existed a threshold nickel loading above which the catalytic metal sulfides would become mobile. The threshold value was depen- dent on the specific system and the operating temperature. The enhanced sintering of molybdenum sulfide, rather than covering-up of active sites by deposits as being suggested in many literatures, was considered as the major cause for deactivation by metal deposits at diffusion-free conditions. The morphology of the metal deposits has significant impact on the deactivation of hydrodemetallation catalyst. Therefore, our results could have important implica- tion. Since segregated large crystallites of nickel deposits lead to less deactivation, in comparison with small crystallites or uniform layer deposition, improved hydrodemet- allation catalyst could be developed by manipulating the morphology of cobalt on the catalyst surface. Thesis Supervisor: James Wei Title: Professor Emeritus of Chemical Engineering Massachusetts Institute of Technology Dean School of Applied Science and Engineering Princeton University Acknowledgments I am indeed indebted to Professor James Wei for mentorship, for lighting the way, for his technical and personal guidance, for an environment I could grow as a scientist. I am also very grateful to my thesis committee members, Professor Charles N. Satterfield, Dr. Miretta F. Stephanopoulos, Professor Klavs F. Jensen and Dr. An- thony J. Garratt-Reed for sharing their wealth of knowledge and many insights during the course of the investigation. Dr. Garratt-Reed deserves a special mention for his invaluable assistance in performing STEM analysis. I would also like to thank Mr. Michael Frongillo for the superb high resolution TEM work. The financial support for the research from Mobil Oil Research and Development Corporation and Chevron Research Company, as well as the Research Assistantship and Fellowships from Department of Chemical Engineering of Massachusetts Institute of Technology are gratefully acknowledged. I also thank Dr. James D. Carruthers and Dr. Robert H. Whitman of American Cyanamid Company at Stamford, Conneticut for providing catalyst samples. I wish to acknowledge the valuable discussions and various supports from the past members of the hydrodemetallation laboratory, especially Dr. Barbara Smith, and Dr. Chi-Wen Hung at Chevron Research Company, and Dr. Kirk Limbach at Rohm and Hass Company. During the first stage of the thesis, fruitful discussions and advice from them were most helpful in defining the scope of the thesis. The completion of the thesis has cost me four years, but they have not been devoid of excitement. The many friends with whom I shared the time have made of MIT a joyful memory, knowing them has been a special prize of four years at MIT. Be it a Friday basketball game, an overnight Practice School visit to Tahoe Casino, or a weekend trip to Cape Cod beach, we always managed to have a good time and still get our work done. Grateful appreciation is expressed to the following, though the 5 list is far from complete: Leo Lue, for all those fun time even since you came to the Zoo; Joy Mendoza, for all the joys we had on the basketball court; Gordon Smith, for the fish and lobsters you cooked; Stathis Avgoustiniatos, for all the good and bad time we shared at Practice School; Marc Moran, for teaching me from juggling to driving; and the many others who were responsible, directly or indirectly, wittingly or unconsciously, to my being and well-beings; ..... I benefited greatly from the friendship and advice of Jirong Xiao, Jiang Yue, Zhicheng Hu. Their helps are greatly appreciated. Many thanks go to Hojoon Park, my first-year roommate, who helped me to adjust from the eastern to the western culture in my crucial first term, and told me the difference between spaghetti and noodle. I wish you the best. Thanks are also due to many other friends who contributed my education at MIT. Of those, Yaping Liu for his help in TEM, and Qing Huang for first introducing me into the world of Athena, where the thesis is eventually born'. Our secretary, Linda Mousseau catered to my every need in a most generous and cheerful way, for which I am very appreciative. My deepest appreciation and love go to my wife, Luhong and my far-away parents, who have sacrificed so much for me, and whose unwavering support and love I have depended on my life. Without them, I could never have taken this endeavor. Thank you, Luhong, Thank you, Mom and Dad, I love you all. Always, in all ways. 1The thesis is written with IATEX. To Luhong Who spent so many lonely nights and weekends during the last four years, but wholeheartedly supported my pursuit with love, encouragement and understanding. To My Parents who never had a chance to have a formal education, but fully understand the importance and benefits of educat- ing their children to the best of their capabilities. Contents Abstract 2 Acknowledgments 4 List of Figures 12 List of Tables 15 1 Introduction and Objectives 16 1.1 Background .......... 16 1.2 Motivation and Objectives . 18 1.3 Literature Review ....... 20 1.3.1 Structure of Sulfided Co - Mo/ - A120 3 Catalyst . 20 1.3.2 Deposition Patterns. 24 1.3.3 Catalyst Deactivation. 27 1.3.4 Migration of Metals on Catalyst Surface ....... 29 2 Thermodynamic Considerations 31 2.1 Introduction. ............................... 31 2.2 Phase Diagrams .............................. 32 2.2.1 Systems with Hydrogen and Hydrogen Sulfide ......... 34 7 CONTENTS 8 2.3 Surface Segregation ............................ 34 3 Hydrodemetallation Experiments 41 3.1 Chapter summary . 41 3.2 Introduction ................................ 42 3.3Equipment . .......................... 42 3.4 Model Compounds ...............
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